Air cooling system for aeroplane engines



Sept. 13, 1932. E. s. MARKS 1,876,996

AIR COOLING SYSTEM FOR AEROPLANE ENGINES Filed Sept. 50, 1929 ATTORNEY5Patented Sept. 13, 193 2 UNITED STATES- (PATENTOFFICE EDWARD S. MARKS,OF SYRACUSE, NEW YORK, ASSIGNOR TO K. H. FRANKLIN MANU- 'IAC'1.URINGCOMPANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK AIR COOLINGSYSTEM FOR AEROPLANE ENGINES Application filed September 30, 1929.Serial No. 396,092.

V This invention relates to air cooling means for hne engines mounted 1naeroplanes to actuate the propeller, particularly aeroplanes.

of the tractor type, and it has forits object,

5 a particularly simple and efficient means for supplying a cooling aircurrent to the cylinders.

The invention consists in the novel features and in the combinations andconstrucm tions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawing, in which like characters designate corresponding parts in allthe views.

one behind the other. The engine has the.

usual pistons, crank shaft etc.

The aeroplane here shown is of the tractor type and 5 designates thepropeller mounted on the front end of the crank shaft.

6 is the hood or casing around the engine, I this being provided withlouvers'? in the side walls thereof. Also, the front of the hood isprovided with slots or louvers 8 which may be opened and closed byshutters as in automobile engines.

9 is the air conduit extending lengthwise of the engine cylinders andarranged to discharge air onto the cylinders and on the heads thereof,this conduit having a downwardly extending casing 10 at its front endwhich is provided with an air intake opening 11 concentric with thecrank shaft, as in the Franklin automobile air cooled engine. Thisopening 11 is arranged to receive some of the current of air from thepropeller 5.

Means is also provided for creating an air current independently of thepropeller, or for boosting the air pressure delivered to the Figure 1 isa dlagrammatic side elevation opening by the propeller, and the meanshere I shown is a centrifugal fan or blower 12 of any well knownconstruction, this being mounted directly upon the crank shaft.

In operation, the propeller feeds air to the intake opening of the airconduit and the fan feeds it with increased velocity through the airconduit to the engine cylinders and efficiently cools the engine,particularly when the plane is on the ground and the engine idling.WVhen the plane is flying at such high altitudes that the engine coolstoo much, the shutters at the front end of the engine casing may beclosed more or less, thus cutting off the air intake from the aircurrent created by the propeller and also restricting the flow ofair tothe fan.

This air cooling system is particularly advantageous in that it rovidesa simple and economical way of a equately cooling line engines inaeroplanes.

What I claim is:

1. In an aeroplane, a frame, a multi-cylin- U der, air cooled, in .lineinternal combustion engine mounted on the frame with the cylinders onebehind the other, a propeller connected to the crank shaft of the engineto be actuated thereby and located in front of the engine, an airconduit arranged to discharge air onto the cylinders to cool the same,the inlet end of said air conduit being arranged in position behind thepropeller to receive air therefrom, and means independent of thepropeller for supplying air to the conduit.

In an aeroplane, a frame, a multi-cylinder, air cooled, in line internalcombustion engine mounted on the frame with the cylinders one behind theother, a propeller connected to the crank shaft of the engine to beactuated thereby and located in front of the engine, an air conduitarranged to discharge air onto the cylinders to cool the same, and a fanlocated in the conduit in juxtaposition to the inlet opening to supplyair to the conduit independently of the propeller.

, 3. In an aeroplane, a frame, a multi-cylinder, air cooled, internalcombustion engine mounted on the frame with the cylinders one behind theother, a propeller mounted on the front end of the crank shaft of theengine, an

air conduit arranged to discharge air onto the cylinders to cool thesame, the air conduit having an intake opening at its front end in therear of the propeller in position to receive the current of air createdby the propeller, and fan means within the conduit for increasing theair flow through the conduit.

4. In an aeroplane, a frame, a multi-cylinder, air cooled, in lineinternal combustion engine mounted on the frame with the cylinders onebehind the other, a propeller connected to the crank shaft of the engineto be actuated thereby and located in front of the en ine, an airconduit arranged to discharge air onto the cylinders to cool the same,the air conduit having an intake opening at the front end of the engineand in the rear of the propeller, a fan actuated by the engine locatedin said intake opening, a casing surrounding the engine and open at itsfront end for receiving a portion of the air current from the propeller.

5. In an aeroplane, a frame, a multi-cylinder, air cooled, internalcombustion engine mounted on the frame with the cylinders one behind theother, a propeller mounted on the front end of the crank shaft of theengine, an air conduit arranged to discharge air onto the cylinders tocool the same, the air conduit having an intake opening located at itsfront end in the rear of the propeller and concern trio with thepropeller, and in position to re- V ceive the current of air created bythe propellor, and a fan mounted on the crank shaft in juxtaposition tosaid opening to create a current of air through the opening and theconduit. i

In testimony whereof, I have hereunto signed no name, at Syracuse, inthe county of Onon aga, and State of New York, this 10th day of August,1929.

EDIVARD S. MARKS.

